1 files changed, 153 insertions, 0 deletions

diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
new file mode 100644
index 000000000000..2b2a889ee2cc
--- /dev/null
+++ b/fs/gfs2/glock.h
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#ifndef __GLOCK_DOT_H__
+#define __GLOCK_DOT_H__
+
+#include "incore.h"
+
+/* Flags for lock requests; used in gfs2_holder gh_flag field.
+   From lm_interface.h:
+#define LM_FLAG_TRY             0x00000001
+#define LM_FLAG_TRY_1CB         0x00000002
+#define LM_FLAG_NOEXP           0x00000004
+#define LM_FLAG_ANY             0x00000008
+#define LM_FLAG_PRIORITY        0x00000010 */
+
+#define GL_LOCAL_EXCL           0x00000020
+#define GL_ASYNC                0x00000040
+#define GL_EXACT                0x00000080
+#define GL_SKIP                 0x00000100
+#define GL_ATIME                0x00000200
+#define GL_NOCACHE              0x00000400
+#define GL_NOCANCEL             0x00001000
+#define GL_AOP                  0x00004000
+#define GL_DUMP                 0x00008000
+
+#define GLR_TRYFAILED           13
+#define GLR_CANCELED            14
+
+static inline int gfs2_glock_is_locked_by_me(struct gfs2_glock *gl)
+{
+        struct gfs2_holder *gh;
+        int locked = 0;
+
+        /* Look in glock's list of holders for one with current task as owner */
+        spin_lock(&gl->gl_spin);
+        list_for_each_entry(gh, &gl->gl_holders, gh_list) {
+                if (gh->gh_owner == current) {
+                        locked = 1;
+                        break;
+                }
+        }
+        spin_unlock(&gl->gl_spin);
+
+        return locked;
+}
+
+static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl)
+{
+        return gl->gl_state == LM_ST_EXCLUSIVE;
+}
+
+static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl)
+{
+        return gl->gl_state == LM_ST_DEFERRED;
+}
+
+static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl)
+{
+        return gl->gl_state == LM_ST_SHARED;
+}
+
+static inline int gfs2_glock_is_blocking(struct gfs2_glock *gl)
+{
+        int ret;
+        spin_lock(&gl->gl_spin);
+        ret = !list_empty(&gl->gl_waiters2) || !list_empty(&gl->gl_waiters3);
+        spin_unlock(&gl->gl_spin);
+        return ret;
+}
+
+int gfs2_glock_get(struct gfs2_sbd *sdp,
+                   u64 number, const struct gfs2_glock_operations *glops,
+                   int create, struct gfs2_glock **glp);
+void gfs2_glock_hold(struct gfs2_glock *gl);
+int gfs2_glock_put(struct gfs2_glock *gl);
+void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
+                      struct gfs2_holder *gh);
+void gfs2_holder_reinit(unsigned int state, unsigned flags,
+                        struct gfs2_holder *gh);
+void gfs2_holder_uninit(struct gfs2_holder *gh);
+
+void gfs2_glock_xmote_th(struct gfs2_glock *gl, unsigned int state, int flags);
+void gfs2_glock_drop_th(struct gfs2_glock *gl);
+
+int gfs2_glock_nq(struct gfs2_holder *gh);
+int gfs2_glock_poll(struct gfs2_holder *gh);
+int gfs2_glock_wait(struct gfs2_holder *gh);
+void gfs2_glock_dq(struct gfs2_holder *gh);
+
+int gfs2_glock_be_greedy(struct gfs2_glock *gl, unsigned int time);
+
+void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
+int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
+                      u64 number, const struct gfs2_glock_operations *glops,
+                      unsigned int state, int flags, struct gfs2_holder *gh);
+
+int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
+void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
+void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
+
+void gfs2_glock_prefetch_num(struct gfs2_sbd *sdp, u64 number,
+                             const struct gfs2_glock_operations *glops,
+                             unsigned int state, int flags);
+void gfs2_glock_inode_squish(struct inode *inode);
+
+/**
+ * gfs2_glock_nq_init - intialize a holder and enqueue it on a glock
+ * @gl: the glock
+ * @state: the state we're requesting
+ * @flags: the modifier flags
+ * @gh: the holder structure
+ *
+ * Returns: 0, GLR_*, or errno
+ */
+
+static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,
+                                     unsigned int state, int flags,
+                                     struct gfs2_holder *gh)
+{
+        int error;
+
+        gfs2_holder_init(gl, state, flags, gh);
+
+        error = gfs2_glock_nq(gh);
+        if (error)
+                gfs2_holder_uninit(gh);
+
+        return error;
+}
+
+/*  Lock Value Block functions  */
+
+int gfs2_lvb_hold(struct gfs2_glock *gl);
+void gfs2_lvb_unhold(struct gfs2_glock *gl);
+
+void gfs2_glock_cb(void *cb_data, unsigned int type, void *data);
+
+void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl);
+void gfs2_reclaim_glock(struct gfs2_sbd *sdp);
+
+void gfs2_scand_internal(struct gfs2_sbd *sdp);
+void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait);
+
+int __init gfs2_glock_init(void);
+
+#endif /* __GLOCK_DOT_H__ */